About: http://webisa.webdatacommons.org/216952153

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Note.- For the purposes of this system, the point referred to above is the lowest part of the aeroplane and the specified datum
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com